// expression: "gives back" (or, returns) some value
//             question = can I...
//                        - print it? (or pass to some function?)
//                        - associate it with a name (via val)?

42
2 * 21
13 > 10
(13 > 10) && ("howdy".length == 5)

// val x = if (5 % 2 == 1) "odd" // no
val y = if (5 % 2 == 1) "odd" else "even"

val s = "howdy" // no
s // yes
s.length // yes
"howdy".uppercase() // yes!

// no
fun myFunc(n: Int): Int {
    return n + 1
}

// yes
myFunc(s.length)
myFunc(myFunc(s.length))


// statements: does not "give back" anything
//             but likely has some "side" effect

println("howdy")
// val z = 1 + 1